Wastewater Clarifier & Concrete Structure Relining
Spalled, rebar-exposed concrete clarifier rebuilt and relined for continued immersion service.
A job completed with Belzona. This describes what the Belzona system does and how it goes on, not a record of a specific project by this distributor.
The challenge
A concrete clarifier and the structures around it sit under constant immersion and steady microbial and chemical attack. Over time the surfaces spalled and degraded, and the embedded rebar became exposed and began to corrode. Once rebar corrodes it expands and breaks away more concrete, so the damage spreads and the structure loses watertightness. Left untreated, the clarifier can no longer hold or contain flow as intended.
The Belzona approach
All unsound and degraded concrete comes out back to a solid base, and the exposed rebar is cleaned. The steel is treated to repassivate it, then a cold-applied repair mortar rebuilds the lost section and returns the original profile. Once the substrate is sound and shaped, the surfaces are lined against immersion so the structure stays watertight and protected from ongoing chemical and microbial attack.
- Assess and isolateA survey of the clarifier and surrounding structures maps spalling, delamination, and the extent of exposed and corroding rebar.
- Remove and cleanUnsound concrete is broken out back to a solid substrate and the exposed rebar is cleaned to a sound condition.
- Repassivate and rebuildThe steel is treated to repassivate it, then a cold-applied repair mortar rebuilds the lost concrete profile.
- Line against immersionA lining goes over the rebuilt surfaces to make them watertight and resistant to chemical and microbial attack.
- Return to serviceThe rebuilt and lined surfaces are confirmed sound and ready for the structure to go back into immersion service.
The result
- Structure rebuilt to its original profile without full concrete replacement
- Exposed rebar repassivated and protected from continued corrosion
- Surfaces lined and watertight under constant immersion
- Clarifier returned to service and protected against ongoing chemical and microbial attack
In the field
More Water & Wastewater projects
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Lift Station Wet Well Rebuild
Acid-gas and immersion damage in a sewage wet well rebuilt with repair mortar and lined against the corrosive flow.
Seeing something like this?
Belzona Houston is the authorized Belzona distributor for South Texas and the Gulf, based in Alvin, Texas, we’ll survey your equipment and recommend the right cold-applied Belzona system, with 24-hour support.